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Federal Register / Vol. 86, No. 134 / Friday, July 16, 2021 / Proposed Rules TABLE II.2EQUIPMENT CLASSES FOR WALK-IN PANELS
Utility
Temperature
Class code
Floor Panel
Structural Wall or Ceiling Panel

Low
Medium
Low

FP.L.
SP.M.
SP.L.

TABLE II.3EQUIPMENT CLASSES FOR WALK-IN REFRIGERATION SYSTEMS
System type
Temperature
Condenser location
Dedicated Condensing

Medium

Indoor
Outdoor
Indoor

Low

Outdoor
Unit Cooler

The applicability of these current equipment classes for certain walk-in products is discussed in more detail in sections II.A.1 through II.A.4 of this document.
1. Display Panels
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A display panel is defined as a panel that is entirely or partially comprised of glass, a transparent material, or both, and is used for display purposes. 10
CFR 431.302. DOE has established a test procedure for calculating total daily energy consumption, based on measured thermal transmittance also U-factor, of display panels. 10 CFR
431.304b1. DOE has not, however, adopted standards for display panels based on energy consumption as at the time of the June 2014 ECS final rule such panels made up a small fraction of the panel market and had a limited energy savings potential. 79 FR 32049, 32067. DOE has identified two manufacturers of display doors who also manufacture display panels.11 Some models of these display panels contain anti-sweat heaters to prevent condensation similar to display doors.
Issue 1: DOE seeks information regarding the thermal transmission through display panels and design characteristics which would affect the thermal transmission, specifically, glass pack 12 design and frame design.
DOE also seeks information regarding 11 Display panel product information from two manufacturers can be found at www.regulations.gov Docket No. EERE2017BTSTD00090001 and Docket No. EERE2017BTSTD00090002.
12 The glass pack in a display door or window of a non-display door is an assembly of glass layers typically filled with low thermal-conductivity inert gas and held together at the edges of the glass by low-conductivity leak-tight spacers.

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Medium
Low

the amount of direct electrical energy consumption of electricity-consuming devices sited on or within display panels, including the amount of antisweat heat required, if any. DOE
additionally requests information on any specific design or use characteristics differentiating display panels from display doors.
2. High-Temperature Freezers DOE has established a test procedure for determining the net capacity and AWEF of walk-in refrigeration systems at appendix C to subpart R of 10 CFR
part 431 Appendix C, which incorporates by reference AHRI
Standard 1250P IP, 2009 Standard for Performance Rating of Walk-In Coolers and Freezers, AHRI 1250
2009. 10 CFR 431.304b4. As defined previously, the storage space i.e., box of a walk-in cooler is refrigerated to temperatures above 32 F, while walk-in freezers are refrigerated to temperatures at or below 32 F. 42
U.S.C. 631120. See also 10 CFR
431.302. The current walk-in test procedure rates medium-temperature refrigeration systems which are used in walk-in coolers at 35 F and lowtemperature refrigeration systems which are used in walk-in freezers at 10 F. See section 5 of AHRI 1250
2009 dry bulb temperature specifications incorporated by reference at 10 CFR 431.303b Consequently, refrigeration system energy use for walk-in coolers is represented by performance at a 35 F
box temperature and refrigeration system energy use for walk-in freezers is represented by performance at a 10 F
box temperature.

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Refrigeration system net capacity Btu/h All Capacities
All Capacities <6,500
6,500 <6,500
6,500
All Capacities <15,500
15,500

Class code DC.M.I.
DC.M.O.
DC.L.I, <6,500.
DC.L.I, 6,500.
DC.L.O, <6,500.
DC.L.O 6,500.
UC.M.
UC.L, <15,500.
UC.L, 15,000.

As discussed in the July 2017 ECS
final rule, stakeholders commented that so-called high-temperature freezer walk-ins are those with a box temperature range of 10 F to 32 F, and that medium-temperature refrigeration systems are generally used for this temperature range. 82 FR 31808, 31830.
As discussed in a RFI published on June 17, 2021 June 2021 TP RFI, hightemperature freezers would be considered walk-in freezers because their room temperature is less than or equal to 32 F, and would therefore be rated at 10 F. 86 FR 32332, 32349. To the extent a medium-temperature refrigeration system is used for hightemperature freezer applications, such a system may not be able to operate at the 10 F room temperature prescribed by the test procedure for freezers. 81 FR
95758, 95790. Although the capacity of medium-temperature models measured at high-temperature freezer application temperatures is commonly reported in product literature, energy use levels are not.13
Issue 2: DOE requests comment on 1
whether there are medium-temperature refrigeration system models that are used exclusively in high temperature freezers, and 2 if a mediumtemperature refrigeration system is efficient for cooler applications, will it also be efficient for use in hightemperature freezer applications. To the extent available, DOE requests data on dedicated condensing unit energy efficiency ratio EER at both high13 Product literature showing capacity measurements of medium-temperature models used in high-temperature freezer applications from two manufacturers can be found at www.regulations.gov Docket No. EERE2017BTSTD00090003 and Docket No. EERE2017BTSTD00090004.

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